名词短语
中文翻译：主震型
同义词：
['foreshock', 'mainshock']
例句：
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1.The earthquake was classified as a foreshock-mainshock type.
这次地震被分类为主震型和余震型。
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2.In the aftermath of the earthquake, we were fortunate to have experienced only foreshock-mainshock type events.
地震之后，我们很幸运只经历了主震型和余震型事件。
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3. The geological survey revealed that the area had been through multiple foreshock-mainshock types.
地质调查发现，该地区经历了多次主震型和余震型。